Preparation method and application of lauramide concrete foaming agent

Abstract

The invention discloses a preparation method and an application of a lauramide concrete foaming agent. The method is characterized in that: lauric acid and hydroxyethylethylene diamine with a molar ratio of 1.0:1.0-1.5 are added into a reaction vessel, a solvent toluene is added, and the mixture is subject to a reaction for 2 to 5 hours under a temperature of 140 to 160 DEG C; the mixture is cooled, and a crude product of a yellow solid is obtained; the crude product is washed by using anhydrous acetone, and is dried, such that a white powdery solid is obtained, wherein the solid is an intermediate; the intermediate, chloroacetic acid and sodium hydroxide are formulated according to a molar ratio of 1:1.0-1.3:2.0-2.6; chloroacetic acid and sodium hydroxide are dissolved in water, such that a sodium monochloroacetate solution with a mass percent concentration of 10 to 20% is prepared; the intermediate is heated to 80 to 90 DEG C until melted, the sodium monochloroacetate solution is dropped into the intermediate, and the mixture is then subject to a reaction for 3 to 5 hours with maintained temperature; the mixture is cooled and filtered, insoluble substances are discarded, and the filtrate is the lauramide concrete foaming agent with excellent foaming performance.

Description

technical field

[0001] The invention belongs to the preparation method of concrete foaming agent and its application research category, relates to a preparation method and application of a laurylamide concrete foaming agent, and is mainly suitable for the manufacture of foamed concrete. Background technique

[0002] In the prior art, commonly used concrete foaming agents mainly include: rosin resins, synthetics, proteins, composites, etc., the main components of which are one or more surfactants. Rosin resin concrete foaming agent can only be used for density greater than 600kg / m2 because of its unsatisfactory foam stability and expansion ratio. 3 The above medium and high density foam concrete cannot be used for 500kg / m 3 The following low-density foamed concrete; although synthetic concrete foaming agent foams quickly and has a high foaming ratio, its foam stability is poor, and it is not suitable for the preparation of low-density foamed concrete; although animal protein...

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